Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
This entry has not been updated since then but may contain minor corrections and revisions.
SMOUCH, n.1. A suppressed laugh, a snigger, smirk (Ork. 1929 Marw.). [smʌux]
[Norw. dial. smolka, to smile or laugh quietly or secretly, smolla, id. The form shows Sc. phonetic development. See P.L.D. § 78.2.]